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NFC in Android

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NFC in Android NFC in Android Martijn Coenen <[email protected]> Agenda ● State of NFC in mobile ● What can you do with NFC in Android? ● Android Beam ● NFC Tags ● Card emulation and HCE ● Q & A State of NFC in mobile NFC and Android ● First NFC-enabled Android device: Nexus S (2010) ● Running Android Gingerbread (2.3) ● Google Wallet launched in 2011 NFC availability in Android devices in 2013 ● Supported by pretty much every Android device maker ● 100% of high-end devices ● Lots of mid-end devices ● Entering low-end devices in 2014 ● NFC will be ubiquitous technology in Android devices What about Bluetooth Low Energy? BLE NFC Range 50 meters 4 centimeters Proximity ~1 meter 4 centimeters accuracy Power draw on 10 - 300mW 1 - 300mW device Life-span of tags ~1-3 years passively powered Cost of tags 20$ 1$ BLE and NFC: different interaction models ● BLE: great for providing context and location ○ Push interaction model ○ Awesome if you push the right data and don’t spam ● NFC: great at showing intent ○ Pull interaction model, undisputed intent, low latency ● Intent could be added to BLE by external factors ○ Consistency is crucial (tapping, waving, twisting, in-app tap...) ○ Facial recognition BLE and NFC: different connections ● BLE: great for persistent connections and broadcasts ○ Perfect for secure connection to wearables (once paired) ○ Public broadcasts (beacons) ● NFC: great for short-lived connections and bootstrapping ○ Quick and secure link because of proximity ○ Small quantities of data ○ Use of NFC tags for pairing devices, configuring Wi-Fi Key takeaway for developers ● The number of NFC devices is still rapidly growing ● BLE is a great complimentary technology ● With device ubiquity, many opportunities for app developers to build magic experiences What can you do with NFC on an Android phone? A lot more than just payment ● P2P data exchange (Android Beam) ● Communicating with passive NFC tags/stickers ● Easily pair with Bluetooth audio devices ● Emulating (smart) NFC tags Android Beam: magic sharing ● Share current context on screen ● Bring two NFC devices in range ● Touch the screen to confirm the send Android Beam: how does it work? ● UI component of Android apps: Activity ● Foreground activity registers data to be sent over NFC ● On NFC tap and touch, the data is sent ● Receiving device launches Activity to handle the data Android Beam data format: NDEF message ● NFC Data Exchange Format ● Standardized by the NFC Forum ● Can be read/written from/to NFC tags ● Can be exchanged over P2P link NDEF Message ● Message has >= 1 records NDEF Record 1 - Type Name Format ● Each record is a single piece of - Type data - ID - Payload NDEF Record 2 - Type Name Format - Type - ID - Payload Corresponding Android APIs NdefRecord rec1 = new NdefRecord( short tnf, // Use NdefRecord.TNF_... byte[] type, byte[] id, byte[] payload); NdefMessage msg = new NdefMessage(rec1, rec2); Some Type Name Formats defined by NFC Forum ● TNF set to NdefRecord.TNF_WELL_KNOWN ○ Type field contains well-known Record Type Definition ○ Use NdefRecord.RTD_URI for Uri record ○ Use NdefRecord.RTD_TEXT for Text record ● TNF set to NdefRecord.TNF_MIME_MEDIA ○ Type field contains mime-type, eg “image/jpeg” ○ Use “application.vnd/...” for app-specific mimes Creating an Uri record NdefRecord uri = new NdefRecord( NdefRecord.TNF_WELL_KNOWN, NdefRecord.RTD_URI, null, “http://www.google.com”.getBytes()); // Or, use the convenience method NdefRecord rec = NdefRecord.createUri( “http://www.google.com”); Creating a mime-type record NdefRecord uri = new NdefRecord( NdefRecord.TNF_MIME_MEDIA, “application.vnd/my.pkg”.getBytes(), null, payloadData); // Or, use the convenience method NdefRecord rec = NdefRecord.createMime( “application.vnd/my.pkg”, payloadData); Telling the NFC service which NDEF message to send // In your Activity onCreate() NfcAdapter adapter = NfcAdapter. getDefaultAdapter(this); NdefRecord rec = NdefRecord.createUri( “http://www.google.com”); NdefMessage msg = new NdefMessage(rec); adapter.setNdefPushMessage(msg, this); // Done! Summarizing Android Beam data flow What happens on the receiving side? ● Android intent system resolves to activity ● An intent is an abstract description of an operation to be performed ● An intent contains an action, eg “ACTION_VIEW” ● An intent contains data, eg the Uri “http://www.google. com” ● An intent may contain a type, eg “image/jpeg” How do intents end up in Android apps? ● Activities can register intent filters to indicate they can handle certain intents ● eg an Activity intent-filter with action “ACTION_VIEW” and type “image/jpeg” means: this Activity can view JPEG data ● When an intent is “launched”, Android evaluates all matching Activities ● If more than one, Activity chooser pops up How NDEF messages are delivered to your app When the receiving device gets an NDEF message over NFC: ● Android creates an intent with action “NfcAdapter. ACTION_NDEF_DISCOVERED” ● Android maps the NDEF TNF/Type to intent data/type ● Android adds the NDEF message to the intent ● Tries to launch an Activity that handles the intent NDEF Message // This is system code Intent nfcIntent = new Intent( NfcAdapter.ACTION_NDEF_DISCOVERED); NDEF Record 1 - Type Name Format nfcIntent.setType(..); // or, setData() - Type - ID - Payload nfcIntent.putExtra( NfcAdapter.EXTRA_NDEF_MESSAGES, ndefMessages); // Usually one startActivity(nfcIntent); NDEF Record 2 - Type Name Format - Type - ID - Payload Mapping of TNF/Type to intent type/data Type Name Type Payload Intent type/data Format TNF_WELL_KNOWN RTD_URI “google.com” setData(Uri.parse(“google.com”)); TNF_WELL_KNOWN RTD_TEXT “My Text” setType(“text/plain”); TNF_MIME_MEDIA “application. 11010000101001111 setType(“application.vnd/my.pkg); vnd/my.pkg” What type do I choose for my record? ● Sometimes obvious, eg an Uri ● If you want to allow other/existing apps to handle data you send, use standard mime-types; eg “text/plain” ● If you want only your app to handle: ○ Either use an app-specific mime-type ○ Use an Android Application Record Android Application Record ● Guaranteed delivery to a specified package ● Even if the package does not support NFC at all, it will still be launched ● Opens up the Play store if the package is not installed Creating an NDEF message with AAR NdefRecord rec = NdefRecord.createUri( “http://www.google.com”); NdefRecord aar = NdefRecord. createApplicationRecord(“com.my.app”); // Creates a msg that delivers the Uri to // “com.my.app” NdefMessage msg = new NdefMessage(rec, aar); Creating an intent-filter on the receiving side // In AndroidManifest.xml <activity …> <intent-filter> <action android:name=”android.nfc.action.NDEF_DISCOVERED” /> <category android:name=”android.intent.category.default” /> <data android:mimeType=”application/vnd.mine” /> </intent-filter> </activity> In your receiving Activity protected void onCreate() { Intent launchIntent = getIntent(); String action = launchIntent.getAction(); if (action.equals(NfcAdapter.ACTION_NDEF_DISCOVERED)) { // Get the first NdefMessage NdefMessage msg = (NdefMessage) intent.getParcelableArrayExtra( NfcAdapter.EXTRA_NDEF_MESSAGES)[0]; // Get the payload of the first record byte[] payloadData = msg.getRecords()[0].getPayload(); // Process payload (on different thread if needed) ... } } What about large data? ● Android Beam has APIs that handover to faster transports ● Allows NFC-initiated file transfer in 5 lines of code ● See NfcAdapter.setBeamPushUris() More information on Beam Android Beam is built using NFC Forum standards ● NDEF specification and RTDs ● LLCP 1.1 specification ● Simple NDEF Exchange Protocol specification ● Connection Handover specification for large data See the NFC developer guide: http://developer.android.com/guide/topics/connectivity/nfc/nfc.html and the Google I/O 2012 NFC talk: http://www.youtube.com/watch?v=HkzPc8ZvCco Android Beam vs social/AirDrop/... sharing ● Beam requires no pre-existing relationship ● Beam requires no data/cloud connectivity ● Beam is less suited for 1-to-many transactions Summarizing Android Beam ● Really easy to add to your app (~50 lines of code) ● Provides a simple and magic sharing experience NFC tags NFC tags ● 40 bytes - 16 KB memory ● Unique or random IDs ● Some allow crypto ● Full smartcards What can you do with NFC tags? ● Attach actions to real physical objects! ● Launched automatically when you tap it ● Many places to stick tags: ○ Consumer products ○ Digital signage (smart posters) ○ Smart devices (for pairing) How are NFC tags handled? ● The beauty of NDEF: this format is used on NFC tags, too ● Reading an NDEF NFC tag ~= receiving the same NDEF data over Android Beam ● AARs can be used on tags as well! Reading/writing NDEF to tags ● All Android devices support NFC Forum standard tags ○ Type1, Type2, Type3, Type4 ● APIs for reading/writing NDEF to tags: http://developer.android. com/reference/android/nfc/tech/Ndef.html Android also supports low-level tag ops ● Sending/receiving raw data over various interfaces/protocols ● ISO-DEP (ISO/IEC 14443-4) ● Nfc-A or Nfc-B (ISO/IEC 14443-3 type A or type B) ● Nfc-F (Felica / JIS-X 6319-4) ● ISO15693 ● NFC Barcode (Kovio -> Thinfilm) Platform tag usecases ● NFC Forum defined “Connection Handover” specification and “Bluetooth SSP” ● Allows using NFC to setup alternate carriers (eg WiFi, Bluetooth) ● Android has implemented Bluetooth audio pairing since JellyBean (Android 4.1) BebaPay: mobile payments in Kenya Card emulation and HCE Card emulation on Android: how did it start? ● Emulate contactless cards ● Contactless payment
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